Optimal design of heat pump integrated low-grade heat utilization systems

Hu, Jinqiu; Fan, Shanhui; Zhang, Bingjian; He, Chang; Liu, Zuming; Chen, Qinglin

doi:10.1016/j.enconman.2022.115619

Cited by 9 publications

(1 citation statement)

References 39 publications

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“…There is a lot of low-grade heat in the industrial production process, such as low-temperature hot water, solar energy, and geothermal energy, which is difficult to use efficiently because of their low temperature. Recovering and making full use of the low-grade heat is a considerable way to improve energy utilization efficiency . The absorption or dehumidification cooling system is a promising air-condition mode because it can control the humidity and temperature of the air independently and can meet many practical engineering applications .…”

Section: Introductionmentioning

confidence: 99%

Deep Utilization of Low-Grade Heat through Compositional Modulation of Multi-Component Liquid Desiccant

Che

Cheng

Tong

et al. 2022

ACS Appl. Mater. Interfaces

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Low-grade heat is a challenge for deep utilization due to its low temperature. Based on the optimization of the saturated vapor pressure of liquid desiccant in absorption or dehumidification cooling systems, an idea of deep utilization of low-grade heat is proposed in this paper. Instead of optimizing the cycle process or equipment, this paper achieves this goal by obtaining a multi-component salt solution with the advantages of both strong moisture absorption capacity and lower regeneration temperature. The sensitivity of saturated vapor pressure to temperature is defined to evaluate the performance of the salt solution, and the sensitivity mechanism is revealed. The results show that the sensitivity of saturated vapor pressure to temperature increases with the increase of ion charge density, and compositional modulation is proposed to improve the sensitivity. The formula of a multi-component salt solution is taken as an example to illustrate the deep utilization of low-grade heat. As a result, the dehumidification performance of the multi-component dehumidification is equivalent to that of the typical desiccant solution, but its regeneration temperature is about 4 K lower. Furthermore, by using the concept proposed in this paper, it is pointed out that the utilization of low-grade heat can be improved by 40% approximately in an absorption cooling system.

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Section: Introductionmentioning

confidence: 99%